Development of a Nondestructive Test Device for Friction Rock Supports.
Lusignea-RW; Felleman-J; Kirby-K
NTIS: PB/83-257519 :135 pages
A device was developed for nondestructive testing of the holding power of split-tube friction rock supports. The device operates by measuring the amount of decrease in internal volume when the support is forced into the drilled hole. The pullout force, or slip load, is a function of the decrease in volume. The device gives readouts of the average internal diameter and predicted pullout force for the support. Laboratory and field tests showed excellent repeatability and good correlation between predicted and actual pullout force. The device is hand-operated, lightweight, and can be used on any friction support.
CP; Final Contract Report;
NTIS Accession No.